134 CATHARINE LINES CHAPIN. 



matogonia, grouped in cysts, surrounded by long follicular cells. 

 The cells of one cyst are undergoing spermatogonial mitosis. 

 A great deal of pigment from the peritoneum appears in this 

 section which was cut near the surface of the testis. 



The germ cells of the right gonad seem to have reached a 

 normal degree of development. The individual, collected in 

 September, with a total length of 46 mm., would have undergone 

 metamorphosis during the following summer. It is probable 

 that the male Spelerpes attains sexual maturity in the fall after 

 metamorphosis. Then this individual : hould have reached 

 maturity in a little over a year. The spermatogonia are just 

 ready to commence the process of maturation. This process in 

 Desmognathus takes about a year, while Kingsbury's obser- 

 vation that, in Spelerpes, regeneration of the lobule begins 

 before the spermatozoa leave it, indicates that possibly the proc- 

 ess of spermatogenesis requires even more time in Spelerpes. 

 Then it may be supposed that these male germ cells of the right 

 gonad would have become ripe spermatozoa at the normal time. 

 The two ova in this gonad, however, are at least a year behind 

 the normal development. In the left gonad, in which there is a 

 greater abnormality, the development of both kinds of germ 

 cells is retarded. 



BIBLIOGRAPHY. 



Ecker, A., & Wiedersheim, R. 



'96 Anatomic des Frosches, auf grund eigener Untersuchungen durchaus neu 



bearbeitet von Dr. Ernst Gaupp. Dritte Abtheilung, pp. 347-355- 

 King, Helen Dean. 



'10 Some Anomalies in the Genital Organs of Bufo lentigenosus and their 

 Probable Significance. Amer. Journ. of Anal., Vol. 10, No. i, January, 

 1910, pp. I59-I75- 

 Kingsbury, B. F. 



'02 Spermatogenesis of Desmognathus fusca. Amer. Journ. of Anal., Vol. r. 



No. 2, February, 1902, pp. 99-135- 

 Knappe, Emil. 



'86 Das Bidder'sche Organ. Morph. Jahrb., Bd. XL, pp. 489-552. 

 St. George, La Valette. 



'95 Zwitterbildung beim kleinen Wassermolch (Triton taeniatus). Arch. 

 Mikr. Anat., Bd. XLV., pp. 1-14- 



